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Proceedings Paper

High-speed microfluidic thermal stimulator for temperature-activated ion channel studies
Author(s): Thomas Pennell; Jianbin Wang; Susan Z. Hua
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Paper Abstract

In this paper we have designed and built a microfluidic thermal chip that provides rapid temperature changes in the solution combined with accurate temperature control. The thermal chip was designed to facilitate the patch-clamp to study temperature dependent activities of ion channels. The device consists of a fluid channel for perfusing solution connected to an accessible reservoir for making patch-clamp measurements on individual cells. A thin film platinum heater was used to generate rapid temperature change and the temperature was monitored using a thin film resistor. The thermal chip was constructed using SU-8 materials on glass wafer to minimize the heat loss to the substrate and channel walls. The chip was characterized for various flow rates ranging from 0.0093 mL/min to 0.0507 mL/min with heater power ranging from 2.7 to 19.4 mW. The heating element is capable of alternating the temperature ranging from bath temperature (20°C) to 90°C at maximum heating rate of 1°C/10 ms. Using the chip, patch clamp recordings were made on cultured HEK cells as the temperature was rapidly varied. The results demonstrated that the thermal chip could be used as a thermal clamp for many thermosensitive ion channel studies.

Paper Details

Date Published: 11 April 2007
PDF: 8 pages
Proc. SPIE 6528, Nanosensors, Microsensors, and Biosensors and Systems 2007, 65280N (11 April 2007); doi: 10.1117/12.714443
Show Author Affiliations
Thomas Pennell, SUNY, Buffalo (United States)
Jianbin Wang, SUNY, Buffalo (United States)
Susan Z. Hua, SUNY, Buffalo (United States)

Published in SPIE Proceedings Vol. 6528:
Nanosensors, Microsensors, and Biosensors and Systems 2007
Vijay K. Varadan, Editor(s)

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